x/EN MR/Na7
Measurements and Recording
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MiCOM P74
VIEW RECORDS
Description
LCD Reference
Start Elements Start I>1, Start I>2, Start I>2BB, Start I>BB, Start IN>1, Start
IN>2, Start IN>2BB, Start IN>BB
Trip Elements
Trip I>1, Trip I>2, Trip IN>1, Trip IN>2, Trip 87BB, Trip
CBFail tBF1, Trip CBFail tBF2, Trip CBFail tBF3, Trip CBFail
tBF4, Trip 50BF (CU), Manual Trip zone, Trip 87BB block,
Dead Zone Trip
Time Stamp Time and date of fault recorder start
Fault Alarms Yes, No
System Frequency 50.00 Hz, 60.00 Hz,
Relay Trip Time Delay between reception of signal and end of trip on PU
IA Feeder phase A current
IB Feeder phase B current
IC Feeder phase C current
IN Feeder phase N current
Select Maint.
Setting range from 0 to 9. This selects the required
maintenance report from the possible 10 that may be
A value of 0 corresponds to the latest report and so on.
Maint. Text
Up to 16 Character description of the occurrence (refer to
following sections).
Maint. Type/Main Data
These cells are numbers representative of the occurrence.
They form a sp
ecific error code which should be quoted in
any related correspondence to Report Data.
Reset Indication
Either Yes or No. This serves to reset the trip LED
indications provided that the relevant protection element has
reset, to reset all LED and relays latched in the PSL, and to
reset the latched alarms.
For extraction from a remote source via communications, refer to the SCADA
Communications section (P74x/EN CT), where the procedure is fully explained.
2.3 Types of event
An event may be a change of state of a control input or output relay, an alarm condition,
setting change etc. The following sections show the various items that constitute an event:
2.3.1 Change of state of opto-isolated inputs
If one or more of the opto (logic) inputs has changed state since the last time that the
protection algorithm ran, the new status is logged as an event. When this event is selected
to be viewed on the LCD, three applicable cells will become visible as shown below:
Time & date of event
“LOGIC INPUTS #”
“Event Value 0101010101010101”
Where # = 1 or 2 depending upon which group of 16 opto inputs is selected. In the case of
P74x relay, however, the value will always be “1” as it is impossible to have more than 16
opto inputs.
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